New Test Suite: Admin UI Components

[jnealey-godaddy]

Summary

Add tests for WordPress admin interface development - only 1 admin columns test currently exists.

Current State

• Only 1 admin columns test
• No metabox tests
• No settings API tests
• No AJAX handler tests

Proposed Tests

Knowledge Tests

• Admin menu hierarchy
• Settings API structure
• Metabox contexts and priorities
• Admin notice types

Execution Tests

• Custom metabox registration and rendering
• Bulk actions on list tables
• AJAX handlers with nonce verification
• Settings API with sections and fields
• Custom admin pages with proper structure
• Admin notices (dismissible, different types)

Why This Matters

Admin UI development is common in plugins and themes. Models should understand WordPress admin patterns.